body {
    background-image: url(bg.png);
    background-repeat:no-repeat;
    background-position:center;
}

.icon_wrap{
    margin: 20% 25% 0 25%;
}

img.appicon{
    max-width:150px;
    width:80%;
}

img.xiaoqu{
    margin-top: 20px;
    max-width:100px;
    width:80%;
 }


.device_text{
    margin-top: 50px;
}

.download_btn{
    margin-top: 20px;
}

img.botton{
    margin-top: 10px;
    width:90%;
    max-width: 300px;
}

div.device_text span{
    font: bold 22px/20px arial,sans-serif;
    color:#696969;
}